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    <title>4.3案例</title>
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<ul type="square"> <!-- 以“空⼼圆”显示⽆序列表 -->
  <li>指针信息</li>
  <li><a href="http://www.baidu.com" target="_self">百度</a></li>
  <li>网易</li>
  <li>百合</li>
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